package com.sky.aspect;

import com.sky.annotaion.Autofill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;


@Aspect
@Component
@Slf4j
public class AutofillAspect {
    /**
     * 切点
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotaion.Autofill)")
    public void autoFillPointCut(){}
    //前置通知,在通知中进行公共字段赋值
    @Before ("autoFillPointCut()")
    public void autofill(JoinPoint joinPoint) throws Exception{
        log.info ("开始进行公共字段填充....");

        //获取当前被拦截方法上的数据库操作类型
        MethodSignature signature = (MethodSignature) joinPoint.getSignature ();//方法签名的对象
        Autofill annotation = signature.getMethod ().getAnnotation (Autofill.class);//获得方法上的注解对象
        OperationType operationType = annotation.value ();//获得数据库操作类型
        //获取当前被拦截方法参数--实体对象
        Object[] args = joinPoint.getArgs ();
        if (args==null || args.length==0){
           return;
        }
        Object entity = args[0];
        //准备赋值数据 --时间 --当前登录用户id
        LocalDateTime now = LocalDateTime.now ();
        Long currentId = BaseContext.getCurrentId ();
        //根据当前不同操作类型，为对应的属性赋值
        if (operationType == OperationType.INSERT){
            //为4个公共字段赋值
                Method setCreateTime = entity.getClass ().getDeclaredMethod (AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass ().getDeclaredMethod (AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateTime = entity.getClass ().getDeclaredMethod (AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass ().getDeclaredMethod (AutoFillConstant.SET_UPDATE_USER, Long.class);
                //为对象属性赋值
                setCreateTime.invoke (entity,now);
                setCreateUser.invoke (entity,currentId);
                setUpdateTime.invoke (entity,now);
                setUpdateUser.invoke (entity,currentId);

        }else if (operationType == OperationType.UPDATE){
            //为两个公共字段赋值
            Method setUpdateTime = entity.getClass ().getDeclaredMethod (AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
            Method setUpdateUser = entity.getClass ().getDeclaredMethod (AutoFillConstant.SET_UPDATE_USER, Long.class);
            //为对象属性赋值
            setUpdateTime.invoke (entity,now);
            setUpdateUser.invoke (entity,currentId);
        }
    }
}
